How a tiny Curiosity motor identified a massive Martian dust storm
A small motor on NASA's Curiosity rover helped scientists detect a major dust storm on Mars, offering early insights into its development.
NASA's Mars Reconnaissance Orbiter (MRO) first detected signs of a massive dust storm on May 30, as dust began to accumulate near Perseverance Valley. This storm, the largest since 2007, eventually forced the solar-powered Opportunity rover to shut down operations by June 8. Meanwhile, on June 5, evidence of the storm's expansion began to appear on the other side of Mars, where NASA's Curiosity rover was operating in Gale Crater.
The unexpected clue came from an actuator, a small motor on Curiosity that controls a sample funnel used for analyzing Martian rock. Benito Prats, an electromechanical engineer at NASA's Goddard Space Flight Center, noticed unusual temperature patterns in the actuator's data. The motor, exposed on the rover's deck, showed a sharp drop in daytime temperatures, a sign that the dust storm was affecting the region.
Prats observed that the temperature patterns aligned with what scientists expect during a dust storm: cooler days due to reduced sunlight and warmer nights as the dusty atmosphere trapped heat. While other instruments on Curiosity, like the Rover Environmental Monitoring Station, also detected the storm's progression, Curiosity's nuclear power source allowed it to continue operations without disruption.
Despite the storm's impact, SAM, the chemistry lab on Curiosity, remained functional. Its actuators are designed to operate at -40 degrees Celsius, and the rover's heaters ensured they stayed within this range. Prats used the actuator temperature data to predict when the storm would subside, estimating that conditions would return to normal by late September. His prediction proved accurate, with temperatures returning to normal around September 18, signaling the storm's end in Gale Crater.
Scientists are still working to understand why some Martian dust storms grow to global scale while others remain small. The data from Curiosity's actuator, though unexpected, highlights the value of all available sources in studying Mars. As researchers continue to refine their models, the goal is to one day predict these events with the same precision as Earth's hurricanes, aiding future robotic and human missions to the Red Planet.
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